Abstract: A sapphire substrate, of which transmittance is higher than 90%, includes two opposite surfaces, wherein at least one of the surfaces has a plurality of bumps thereon, and the surface roughness of the surface with the bumps is less than 100 nm. The distance between tops of two neighboring bumps is between 150 nm and 500 nm. Each of the bumps is higher than 60 nm. For each bump, the ratio of the height and the width of a bottom thereof connected to the corresponding surface is greater than 0.4. The sapphire substrate can be used in products such as all kinds of lens protective covers, panels, and smart phones.

Abstract: A planar light source module including a light guide plate (LGP), a light source, an optical film, and a reflector is provided. The light source for emitting a light beam is disposed adjacent to the side light-incident surface, wherein the light beam enters the LGP from a side light-incident surface and leaves the LGP from a light-emergence surface in an emergence angle ?1, ?1?70 degrees. The optical film is disposed above the LGP to collimate the light beam from the LGP. The optical film includes a prism layer module and a bonding layer module stacked alternately. The prism layer module comprises prism layers and each prism layer includes micro-prisms. The bonding layer module comprises at least one bonding layer bonded with two prism layers adjacent thereto. The refraction index of the prism layers is greater than that of the bonding layer. The reflector is disposed under the bottom surface.

Abstract: A light guide plate including a transparent light guide substrate and a micro-structural reflective film is provided. The transparent light guide substrate has a light-emitting surface, a bottom surface opposite to the light-emitting surface, and at least one light incident surface connecting the light-emitting surface and the bottom surface. The micro-structural reflective film is disposed below the bottom surface of the transparent light guide substrate and includes a micro-structural layer and a reflective material layer. The micro-structural layer has a plurality of micro-structures, and the reflective material layer covers the micro-structures of the micro-structural layer. Only top ends of the micro-structures and the reflective material layer are laminated on the transparent light guide substrate, such that there is an air gap between the transparent light guide substrate and the micro-structural reflective film. Furthermore, a light-emitting apparatus having the light guide plate is also provided.

Abstract: A light guide plate including a transparent light guide substrate and a micro-structural reflective film is provided. The transparent light guide substrate has a light-emitting surface, a bottom surface opposite to the light-emitting surface, and at least one light incident surface connecting the light-emitting surface and the bottom surface. The micro-structural reflective film is disposed below the bottom surface of the transparent light guide substrate and includes a micro-structural layer and a reflective material layer. The micro-structural layer has a plurality of micro-structures, and the reflective material layer covers the micro-structures of the micro-structural layer. Only top ends of the micro-structures and the reflective material layer are laminated on the transparent light guide substrate, such that there is an air gap between the transparent light guide substrate and the micro-structural reflective film. Furthermore, a light-emitting apparatus having the light guide plate is also provided.

Abstract: A passive optical device includes a first substrate, a second substrate, a stabilized liquid crystal (LC) layer and a surface micro-structure layer. The stabilized LC layer is disposed between the first substrate and the second substrate and has a polarization beam-splitting function via an aligning direction of liquid crystal molecules. The surface micro-structure layer is disposed on an exterior surface of at least one of the first substrate and the second substrate and used to produce a light-collecting effect.

Abstract: A coupling device including a reflective cavity, at least one light source, and a light guide plate is provided. The reflective cavity has an opening, and includes a top surface, a bottom surface, a first side surface, a second side surface, and an end surface opposite to the opening. The light source is disposed at a position of the end surface. A side surface of the light guide plate is connected with the opening, and a thickness of the light guide plate is smaller than that of the light source.

Abstract: A light guide plate with a light emitting surface, a bottom surface and at least one light incident surface being connected with the light emitting surface and the bottom surface is provided. The light guide plate is a superposition of a plurality of layers substantially parallel to the light emitting surface. A plurality of stripe-shaped light-controlling structures are formed on the light emitting surface and a plurality of light-reflecting structures are formed on the bottom surface. The light guide plate provides a surface light source with high brightness and excellent uniformity in a direction perpendicular to the light emitting surface.